The digital signature is a mechanism making it possible to guarantee the integrity of an electronic document and to authenticate its author, by analogy with the handwritten signature of a paper document.
For this, the following conditions must be met:
- authentic: the identity of the signatory must be able to be traced with certainty;
- forgery-proof: the signature cannot be forged. Someone cannot pass themselves off as another;
- non-reusable: the signature is not reusable. It is part of the signed document and cannot be moved to another document;
- unalterable: a signed document is unalterable. Once it is signed, it cannot be modified any more;
- irrevocable: the person who signed cannot deny it.
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